Compound Heat Transfer Enhancement of Wavy Fin-and-Tube Heat Exchangers through Boundary Layer Restarting and Swirled Flow
Ali Sadeghianjahromi,
Saeid Kheradmand,
Hossain Nemati,
Jane-Sunn Liaw and
Chi-Chuan Wang
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Ali Sadeghianjahromi: Department of Mechanical and Aerospace Engineering, Malek-Ashtar University of Technology, Shahin-shahr, P.O. Box 83145/115, Isfahan, Iran
Saeid Kheradmand: Department of Mechanical and Aerospace Engineering, Malek-Ashtar University of Technology, Shahin-shahr, P.O. Box 83145/115, Isfahan, Iran
Hossain Nemati: Department of Mechanics, Marvdasht Branch, Islamic Azad University, Marvdasht 73711-13119, Iran
Jane-Sunn Liaw: Green Energy & Environment Research Laboratories, Industrial Technology Research Institute, Hsinchu 310, Taiwan
Chi-Chuan Wang: Department of Mechanical Engineering, National Chiao Tung University, EE474, 1001 University Road, Hsinchu 300, Taiwan
Energies, 2018, vol. 11, issue 8, 1-19
Abstract:
This study performs a 3D turbulent flow numerical simulation to improve heat transfer characteristics of wavy fin-and-tube heat exchangers. A compound design encompassing louver, flat, and vortex generator onto wavy fins can significantly enhance the heat transfer performance of wavy fin-and-tube heat exchangers. Replacement of wavy fins around tubes with flat fins is not effective as far as the reduction of thermal resistance is concerned, although an appreciable pressure drop reduction can be achieved. Adding two louvers with a width of 8 mm to the flat portion can reduce thermal resistance up to 6% in comparison with the reference wavy fin. Increasing the louver number and width can further decrease the thermal resistance. Also, it is found that the optimum louver angle is equal to the wavy angle for offering the lowest thermal resistance. Therefore, compound geometry with three louvers, a width of 12 mm, and the louver angle being equal to wavy angle with waffle height to be the same as fin pitch of the reference wavy fin has the most reduction in thermal resistance of 16% for a pumping power of 0.001 W. Adding punching longitudinal vortex generators on this compound geometry can further decrease thermal resistance up to 18%.
Keywords: wavy fin-and-tube heat exchanger; louver fin; vortex generators; numerical simulation; heat transfer enhancement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:gam:jeners:v:11:y:2018:i:8:p:1959-:d:160452
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